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/*----------------------------------------------------------------

//                                                              //

//  boot-loader.h                                               //

//                                                              //

//  This file is part of the Amber project                      //

//  http://www.opencores.org/project,amber                      //

//                                                              //

//  Description                                                 //

//  Defines for the boot-loader application.                    //

//                                                              //

//  Author(s):                                                  //

//      - Conor Santifort, csantifort.amber@gmail.com           //

//                                                              //

//////////////////////////////////////////////////////////////////

//                                                              //

// Copyright (C) 2010 Authors and OPENCORES.ORG                 //

//                                                              //

// This source file may be used and distributed without         //

// restriction provided that this copyright statement is not    //

// removed from the file and that any derivative work contains  //

// the original copyright notice and the associated disclaimer. //

//                                                              //

// This source file is free software; you can redistribute it   //

// and/or modify it under the terms of the GNU Lesser General   //

// Public License as published by the Free Software Foundation; //

// either version 2.1 of the License, or (at your option) any   //

// later version.                                               //

//                                                              //

// This source is distributed in the hope that it will be       //

// useful, but WITHOUT ANY WARRANTY; without even the implied   //

// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      //

// PURPOSE.  See the GNU Lesser General Public License for more //

// details.                                                     //

//                                                              //

// You should have received a copy of the GNU Lesser General    //

// Public License along with this source; if not, download it   //

// from http://www.opencores.org/lgpl.shtml                     //

//                                                              //

----------------------------------------------------------------*/

#define TELNET_PORT         23

#define MAX_PACKET_SIZE     2000

#define ETHMAC_RX_BUFFERS   8

#define TCP_TX_BUFFERS      256

#define TELNET_WILL 251

#define TELNET_WONT 252

#define TELNET_DO   253

#define TELNET_DONT 254

#define UDP_READ  1

#define UDP_WRITE 2

#define UDP_DATA  3

#define UDP_ACK   4

#define UDP_ERROR 5

/* Generic MII registers. */

/* Taken from kernel source file include/linux/mii.h */

#define MII_BMCR            0x00        /* Basic mode control register */

#define MII_BMSR            0x01        /* Basic mode status register  */

#define MII_PHYSID1         0x02        /* PHYS ID 1                   */

#define MII_PHYSID2         0x03        /* PHYS ID 2                   */

#define MII_ADVERTISE       0x04        /* Advertisement control reg   */

#define MII_LPA             0x05        /* Link partner ability reg    */

#define MII_EXPANSION       0x06        /* Expansion register          */

#define MII_CTRL1000        0x09        /* 1000BASE-T control          */

#define MII_STAT1000        0x0a        /* 1000BASE-T status           */

#define MII_ESTATUS         0x0f        /* Extended Status */

#define MII_DCOUNTER        0x12        /* Disconnect counter          */

#define MII_FCSCOUNTER      0x13        /* False carrier counter       */

#define MII_NWAYTEST        0x14        /* N-way auto-neg test reg     */

#define MII_RERRCOUNTER     0x15        /* Receive error counter       */

#define MII_SREVISION       0x16        /* Silicon revision            */

#define MII_RESV1           0x17        /* Reserved...                 */

#define MII_LBRERROR        0x18        /* Lpback, rx, bypass error    */

#define MII_PHYADDR         0x19        /* PHY address                 */

#define MII_RESV2           0x1a        /* Reserved...                 */

#define MII_TPISTATUS       0x1b        /* TPI status for 10mbps       */

#define MII_NCONFIG         0x1c        /* Network interface config    */

/* Basic mode control register. */

/* Taken from kernel source file include/linux/mii.h */

#define BMCR_RESV               0x003f  /* Unused...                   */

#define BMCR_SPEED1000          0x0040  /* MSB of Speed (1000)         */

#define BMCR_CTST               0x0080  /* Collision test              */

#define BMCR_FULLDPLX           0x0100  /* Full duplex                 */

#define BMCR_ANRESTART          0x0200  /* Auto negotiation restart    */

#define BMCR_ISOLATE            0x0400  /* Disconnect DP83840 from MII */

#define BMCR_PDOWN              0x0800  /* Powerdown the DP83840       */

#define BMCR_ANENABLE           0x1000  /* Enable auto negotiation     */

#define BMCR_SPEED100           0x2000  /* Select 100Mbps              */

#define BMCR_LOOPBACK           0x4000  /* TXD loopback bits           */

#define BMCR_RESET              0x8000  /* Reset the DP83840           */

/* Basic mode status register. */

/* Taken from kernel source file include/linux/mii.h */

#define BMSR_ERCAP              0x0001  /* Ext-reg capability          */

#define BMSR_JCD                0x0002  /* Jabber detected             */

#define BMSR_LSTATUS            0x0004  /* Link status                 */

#define BMSR_ANEGCAPABLE        0x0008  /* Able to do auto-negotiation */

#define BMSR_RFAULT             0x0010  /* Remote fault detected       */

#define BMSR_ANEGCOMPLETE       0x0020  /* Auto-negotiation complete   */

#define BMSR_RESV               0x00c0  /* Unused...                   */

#define BMSR_ESTATEN            0x0100  /* Extended Status in R15 */

#define BMSR_100HALF2           0x0200  /* Can do 100BASE-T2 HDX */

#define BMSR_100FULL2           0x0400  /* Can do 100BASE-T2 FDX */

#define BMSR_10HALF             0x0800  /* Can do 10mbps, half-duplex  */

#define BMSR_10FULL             0x1000  /* Can do 10mbps, full-duplex  */

#define BMSR_100HALF            0x2000  /* Can do 100mbps, half-duplex */

#define BMSR_100FULL            0x4000  /* Can do 100mbps, full-duplex */

#define BMSR_100BASE4           0x8000  /* Can do 100mbps, 4k packets  */

typedef struct {

    unsigned char mac[6];

    unsigned char ip[4];

} mac_ip_t;

typedef struct {

    unsigned char ip[4];

} ip_t;

typedef struct {

    unsigned char mac[6];

    unsigned char stuffing[2]; /* word aligned */

} mac_t;

typedef struct {

    unsigned int payload_valid;

    unsigned int starting_seq;

    unsigned int ending_seq;

    unsigned int len_bytes;

    unsigned int ack_received;

    time_t       resend_time;

    char         buf[MAX_PACKET_SIZE];

} packet_buffer_t;

typedef struct {

    /* Ethernet */

    unsigned char   src_mac[6];

    unsigned char   dst_mac[6];

    unsigned int    eth_type;

    /* IPv4 */

    unsigned char   src_ip[4];

    unsigned char   dst_ip[4];

    unsigned int    ip_len;        // IP; in bytres

    unsigned int    ip_header_len; // IP; in 32-bit words

    unsigned int    ip_proto;

    /* TCP */

    unsigned int    tcp_src_port;

    unsigned int    tcp_dst_port;

    unsigned int    tcp_hdr_len;

    unsigned int    tcp_seq;

    unsigned int    tcp_ack;

    unsigned int    tcp_flags;

    unsigned int    tcp_window_size;

    /* the TCP that sent this option will right-shift its true

       receive-window values by 'shift.cnt' bits for transmission in

       SEG.WND. */

    unsigned int    tcp_window_scale;

    unsigned int    tcp_len;

    unsigned int    tcp_payload_len;

    unsigned int    tcp_src_time_stamp;

    /* Telnet */

    unsigned int    telnet_payload_len;

} packet_t;

/* Enumerated types */

enum mdi_ctrl {

        mdi_write = 0x04000000,

        mdi_read  = 0x08000000,

        mdi_ready = 0x10000000,

};

enum telnet_state {

        TELNET_CLOSED    = 0,

        TELNET_OPEN      = 1

};

/* Global Variables */

extern mac_ip_t    self_g;

/* Functions */

void            init_packet             ();

unsigned short  header_checksum16       (unsigned char *buf, unsigned short len, unsigned int sum);

void            arp_reply               (mac_t*, ip_t*);

void            ping_reply              (packet_t* packet0, int ping_id, int ping_seq, char * rx_buf);

void            ethernet_header         (char*, mac_t*, unsigned short);

void            ip_header               (char*, ip_t*, unsigned short, char);

void            parse_rx_packet         (char*, packet_t*);

void            parse_arp_packet        (char*);

void            parse_ip_packet         (char*, packet_t*);

void            parse_ping_packet       (char*, packet_t*);